Results 81 to 90 of about 3,484,140 (246)

The Effect of Heart Rate on the Heart Rate Variability Response to Autonomic Interventions

open access: yesFrontiers in Physiology, 2013
Heart rate variability (HRV), the beat-to-beat variation in either heart rate (HR) or heart period (R-R interval), has become a popular clinical and investigational tool to quantify cardiac autonomic regulation. However, it is not widely appreciated that,
George E Billman
doaj   +1 more source

Mobilisation readiness state and the frequency structure of heart rate variability [PDF]

open access: yesRoss Fiziol Zh Im I M Sechenova. 2009 Apr;95(4):367-75., 2010
A number of studies showed association of mental status with heart rate variability. This work discovered a feature of frequency structure of heart rate variability that is associated with mental readiness. In three independent groups of 64, 39, and 19 volunteers by the factor analysis of heart rate periodograms, it has been discovered that there are ...
arxiv  

Prediction of VO\u3csub\u3e2\u3c/sub\u3e Peak Using Sub-Maximum Bench Step Test in Children [PDF]

open access: yes, 2011
The purpose of this study was to develop a valid prediction of maximal oxygen uptake from data collected during a submaximum bench stepping test among children ages 8-12 years.
Jacks, Dean E   +2 more
core   +1 more source

Heart Rate Variability and Heart Rate Recovery as prognostic factors [PDF]

open access: yesMedicine and Pharmacy Reports, 2015
Background Heart rate (HR) can appear static and regular at a time at rest, during exercise or recovery after exercise. However, HR is constantly adjusted due to factors such as breathing, blood pressure control, thermoregulation and the renin-angiotensin system, leading to a more dynamic response that can be quantified using HRV (heart rate ...
openaire   +3 more sources

Discrete Scale Invariance in the Cascade Heart Rate Variability Of Healthy Humans [PDF]

open access: yesarXiv, 2004
Evidence of discrete scale invariance (DSI) in daytime healthy heart rate variability (HRV) is presented based on the log-periodic power law scaling of the heart beat interval increment. Our analysis suggests multiple DSI groups and a dynamic cascading process. A cascade model is presented to simulate such a property.
arxiv  

Model-driven Heart Rate Estimation and Heart Murmur Detection based on Phonocardiogram [PDF]

open access: yesarXiv
Acoustic signals are crucial for health monitoring, particularly heart sounds which provide essential data like heart rate and detect cardiac anomalies such as murmurs. This study utilizes a publicly available phonocardiogram (PCG) dataset to estimate heart rate using model-driven methods and extends the best-performing model to a multi-task learning ...
arxiv  

What does the correlation dimension of the human heart rate measure? [PDF]

open access: yesarXiv, 2001
It is shown that in the case of human heart rate, the scaling behaviour of the correlation sum (calculated by the Grassberger-Procaccia algorithm) is a result of the interplay of various factors: finite resolution of the apparatus (finite-size effects), a wide dynamic range of mean heart rate, the amplitude of short-time variability being a decreasing ...
arxiv  

Heart Rate Patterns Observed in Medical Monitoring [PDF]

open access: yes, 1964
Medical monitoring of heart rate patterns during conditions of sleep, quiet rest, breath-holding, hypoxia, and increased g forces of aircraft ...
Johnson, R. L., Simons, D. G.
core   +1 more source

Heart rate impact on the reproducibility of heart rate variability analysis

open access: yesInternational Journal of Cardiology, 2013
stiffness in hypertensive patients through endothelial dysfunction. Diabetologia 2012;55:1847–55. [7] Giannarelli C, Bianchini E, Bruno RM, et al. Local carotid stiffness and intima–media thickness assessment by a novel ultrasound-based system in essential hypertension. Atherosclerosis 2012;223:372–7. [8] Lee MO, Song SH, Jung S, et al.
Sacha, Jerzy   +3 more
openaire   +4 more sources

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